Electrochemical testing device and method for observing columnar lithium electrode by atomic force microscope

Abstract

The invention provides an electrochemical testing device and method for observing a columnar lithium electrode by an atomic force microscope. The testing device comprises an atomic force microscope; an electrochemical cell; electrodes and an electrochemical workstation, which are located in in the electrochemical cell. The electrodes comprise an annular counter electrode, a reference electrode anda working electrode, wherein the electrodes are connected with an electrochemical workstation through a conducting circuit. The device is characterized in that the annular counter electrode and the reference electrode are fixed inside the electrochemical cell; the working electrode is a columnar metal lithium working electrode, and the columnar metal lithium working electrode is vertically fixedbelow the center of the annular counter electrode; an inner buckle cover is arranged above the electrochemical cell, the inner buckle cover is arranged between a scanning head of the atomic force microscope and the liquid phase probe clamp and can cover the upper surface of the electrochemical cell, and the liquid phase probe carries out a scanning test on the top surface of the columnar metal lithium working electrode.

Description

technical field [0001] The invention belongs to the technical field of in-situ electrochemical testing, and in particular relates to an electrochemical testing device and method for observing a columnar lithium electrode with an atomic force microscope, which can realize in-situ monitoring of the evolution process of the interface structure of a liquid metal lithium battery system during charging and discharging. Real-time monitoring of electrochemical atomic force microscopy. Background technique [0002] Metal lithium anode is considered to be the most promising anode material for high specific energy secondary lithium batteries because of its high theoretical specific capacity of 3860mAh / g and the lowest electrochemical potential (-3.04V). The important research direction of metal lithium anode is to explore the uncontrollable lithium dendrite growth, obvious volume expansion and unstable solid electrolyte interface (SEI) film to bring about safety hazards and capacity fa...

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Problems solved by technology

[0006] At present, the in-situ electrochemical atomic force microscope can be applied to the liquid environment to carry out the visualization research of the evolution process of the metal lithium electrode / electrolyte interface and the corresponding reaction kinetics, but there are still the following shortcomings: (1) it is only applicable to Lithium-shaped metal working electrode system, the applicable working electrode form is single and limited; (2) Most of them are open electrolyte systems, which cannot be used for the detection of volatile electrolyte systems; (3) The structure is complex and the disassembly and assembly are cumbersome

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